If there was a perfectly legal way of running without submitting to a test, it might be worth it. Particularly if it avoided being tested by somebody like we used to have at Ipswich who would go out of his way to fail you even if it meant making faults up. You really had to know the testers manual to get through.
There was also the time the tester, a much more helpful chap, gave me the opportunity to adjust a headlamp beam during the test. He was so helpful in fact, he attempted to do it himself, dislodged the screw and the headlamp fell out and smashed on the ground. ''Oh, I'll have to fail you for that'' he said.......